S9 fan overspeed indication (30600 rpm!)

[Biodom]

Had anyone had a situation where one fan shows 30600 rpm?
I have one S9 that does it, consequently second fan under-spins at 2280 rpm; PCBs are a bit hot and miner periodically loses a board (randomly).
The board comes back upon soft or hard restart, but fan speed keeps at 30600.

Q:
1. did it happen to you?
2. if it did, can anything help the situation?

I am reluctant to sent this S9 for repair because apart from showing high fan speed, miner works OK, until it drops a board, that is.
However, since restart brings it back, it is not that big of a deal.
please, let me know.

[VRobb]

It's a known bug. Not sure what can done about it unless you aren't running the latest firmware, but updating firmware is its own thing...

[Biodom]

It's a known bug. Not sure what can done about it unless you aren't running the latest firmware, but updating firmware is its own thing...

Thanks.

I did not update the software because it is such a nuisance. So far it never helped with anything.
Right now this S9 (early autotuning batch) restarts in just 5-6 min.
If this is the only thing that helps, I might do it, reluctantly.

[fanatic26]

Just to give you an idea of how common that bug is here is a screenshot of 30 miners with 8 of them showing the bug.

[Biodom]

@fanatic26: wow, high % as 8/30=~27%.

So, it is un-fixable?

Even soft update does not help or you did not bother?

[fanatic26]

No firmware changes have ever fixed this. It is something I have dealt with on these s9s since the beginning. As it doesnt affect mining in any way that I have ever noticed I just chalked it up to bitmains laziness in that they dont care to patch it.

[Biodom]

No firmware changes have ever fixed this. It is something I have dealt with on these s9s since the beginning. As it doesnt affect mining in any way that I have ever noticed I just chalked it up to bitmains laziness in that they dont care to patch it.

Thanks, it means that I should not bother upgrading the system.
You are probably located in a colder climate because in my case (higher ambient), PCB temp goes to 79-80C and one board drops from time to time.